Container



y 1940- c. K. DUNLAP 2.209,449

CONTAINER Filed- May 3, 1938 2 Sheets-Sheet 1 C.K.DUNLAP July so, 1940.

CONTAINER Filed May 5. 1938 2 Sheets-Sheet 2 3mm GZaQ rZeGEIwnZQ v, 9%,69 M; 9%;

Patented July 30, 1940 UNITED STATES PATENT OFFICE CONTAINER.

Application May 3, 1938, Serial No. 205,825

3 Claims.

This invention relates to containers of the type designed and intendedfor use in the packaging and dispensing of liquids, such for instance aslubricating oils.

Primarily the invention is concerned with containers fabricated entirelyof paper and which,.

* after having been emptied, can readily be disposed of by burning,having no metallic parts. A principal objective of the invention is theprovision of an all-paper container 'of low cost, which isself-supporting, sufficiently rugged to withstand all shocks incident totransportation and handling, and which is so treated with a -moisturerepelling coating ,that its oil or other liquid contents cannotpenetrate its fibrous walls to weaken the same and possibly result inleakage. I have discovered that a liquid will rapidly penetrate into andsaturate a paper sheet when it is brought into contact with an edge ofthe sheet, the liquid travelling by capillary action rapidly in theplane in which the fibers are deposited during the formation of thesheet. Penetration of 1 liquid transversely into and through a papersheet when applied to aside surface of the sheet proceeds at a muchslower rate. Hence the present invention contemplates the fabrication ofcontainers formed of paper in sheet form, in which the several componentelements of the container are so shaped and. so assembled together thatthe liquid with which the container is filled does not have at any timeaccess to the edge of a sheet.

It is also highly desirable that a container when fabricated of paper berendered resistant to the penetration of moisture from without since thestrength of its wall decreases as the moisture content thereof increasesand the penetration of a substantial amount of moisture into the wall ofa paper container from the outside thereof will result in its earlyfailure. The invention contemplates, therefore, a paper container boththe exterior and interior surfaces of which have been renderedimpervious to moisture. All interior surfaces of the container arecoated with -a suitable moisture-proof coating composition. The exteriorsurfaces thereof maybe so treated or may be protected against moistureby the application of a moisture-resistant envelope. This envelope maybe in the form of a label secured to the outer surface of the containerby means of an adhesive or in the form of a tubular envelope telescopedover the container body and secured in position, for instance bycrimping the ends of the tube inwardly over the container endclosures.

Various forms of the invention are indicated in the accompanyingdrawings, in which:

Figure 1 is a side elevation of. a preferred form of container,partially broken away to show the details of construction;

Figure 2 is an axial section through portion of a container of the typeshown in Figure 1, the end closure construction of the container ofFigure 2, however, differing in minor respects from the end closure ofthe container shown in Figure 1;

' Figure 3 is a plan viewon a reduced scale of the paper blank fromwhich the body of the container shown in Figure 2 is fabricated;

Figure 4 is a view similar to Figure 2, the section being taken,however, through a third form of container;

Figure 5 shows partially in elevation and partially in section acontainer of the type shown in Figure 1, one end of the container havingbeen removed, and a pouring funnel being positioned thereon;

Figures 6 and '7-are views similar to Figure 1 but showing modifiedforms of containers.

The principal member of each of the containers shown comprises a tubularbody, preferably a hollow cylindrical body formed by winding a blankupon a cylindrical mandrel, the wall being built up of several plies orconvolutions of paper secured together by an adhesive. The tubular bodyof the container shown in Figure 1 is indicated at I and is three pliesin thickness. The closures for the end'of the body Ill are identical andone such closure will be described. It comprises two discs, an innerdisc II and an outer disc H, the inner disc ll having a peripheralcylindrical flange I3 and the outer disc I! having a peripheralcylindrical flange H. The inner disc lies wholly .within the containerbody and the cylindrical outer surface of its flange I3 is secured tothe inner surface of the body In by a suitable adhesive. It will beobserved that short, cylindrical portions of the body Let the endsthereof, are inwardly displaced. This is accomplished by rolling orpressing operations. The peripheral flange llof the outer closure discI! fits snugly in the recess thus provided by the Prior to assemblingthe several parts of the container the inner surface of the containerbody I0 is thoroughly coated with a film of a substance having thecapacity to resist the penetration of the liquid commodity which thecontainer is intended to receive. Where the container is primarilydesigned to receive and dispense oils this coating may advantageously beglue, since glue is resistant to the action of oils and oily substances.Thereafter the inner disc ll of the end closure is applied after theface of this disc, and the exterior surface of its peripheral flange l3,has been coated with a suitable moisture penetration-resisting film. Thefilm of coating material on the inner surface of the body I0 isindicated at It and that on the disc II at H, these two films merging inthe cylindrical joint between flange l3 and the cylinder wall. Prior toassembly of the closure disc |2 a coating I8 is applied to one face andto the cylindrical inner surface of flange l4. Advantageously thiscoating material may also be ,glue and the disc is applied while theglue is moist. To prevent the escape of air trapped between the discs IIand I2 theouter disc I2 is perforated at l9 and to effect closure ofthis perforation after assembly has been completed, a sufficientquantity of coating substance is placed on the inner surface of disc|2this coating substance running into the aperture l9 and securing thesame after assembly of disc I2 has been completed. Naturally thecontainer is charged before the application of the second end closure.The label |5 applied exteriorly is preferably of moisture-re- .sistingmaterial such as thin paper, treated with a substance to render itmoisture-proof. The container thus formed costs but little and issufllciently strong to stand dropping or rough usage without leaking.

When its contents are to be removed one entire and may be taken off,asfor instance by cuttingthe body In and label l5 along the line (1-4:,Figure l. Thereafter a paper funnel 20, in the form of a hollow frustumof a cone is slipped over the open end of a container so that itscontents may be readily discharged into a restricted opening uponinversion'of the container and funnel. Both container and funnel may bedestroyed by burning after the contents of the container have beenremoved.

In Figure 2 a slightly modified form of container is shown in which therecess for the reception of the flange 22 of the outer closure discmember 23 is formed by a cutting or grinding operation. Or,alternatively, the body of the container may be fabricated of a blank orpaper sheet such as indicated at 25 in Figure 3, that portion of thesheet which will comprise the last or outer convolution of the bodyafter the sheet has been wound onto themandrel being cut away asindicated at 26 so that, after the cylindrical body has been completelyformed it will have exterior annular recesses or grooves at its endswhich terminate in well defined shoulders, one of which is shown inFigure 2. A label or envelope of moisture-proof material, such as coatedor impregnatedpaper, isindicated at 21 and for the same purpose, as isthe generally similar envelope l5 shown in Figure 1. Layers of coatingmaterial upon the body and end discs are indicated respectively at 28,29 and 30.

The form of the invention disclosed in Figure 4 is generally similar butin this form the ends of the tubular body 35 are not recessed to receiveflanged disc.

ure 6 the flanged end discs 4!! and 4| are nestedas shown and themoisture-proof envelope 42 covers the entire outer surface of thecylindrical paper body 43 and has its end margins inturned and extendingbetween the flanges 44 and 45 of the end closure discs 4|) and 4|,respectively, be-

ing secured to these flanges by a suitable adhesive. In the case of thisform of the invention the container body 43 is interiorly coated asbefore, likewise the inner surfaces of both discs 40 and 4|, and theflanges of such discs. If desired, the discs 40 and 4| 'may be dipped ina coating substance such as glue so that all surfaces thereof are coatedwith the moisture-resisting substance.

In the form of the invention shown in Figure 7 the body has its endsinwardly pressed or displaced and each end closure comprises an innerdisc 5| and an outer disc 52, the flange 53 of the inner disc beingattached to the cylindrical inner surface of the inwardly displaced endportion of the body 50 and the flange 54 of the outer disc 52 lyingwithin the recess formed by the inward displacement of the end of thebody. Instead of an envelope which is secured to the outer surface ofbody ID by means of an adhesive, as in the case of the forms of theinvention shown in Figures 1, 2 and 6, an envelope 55 which comprises apaper tube is telescoped over the body 50, its inner surface closelyfitting against the outer surface of body 50. After it is thus assembledthe ends of the envelope 55 are laterally and inwardly crimped as shownin Figure 7 so as to overlie and engage the outer end disc 52, theenvelope by this means being retained in position and likewise servingto positively hold the closure discs 5| and 52 in position. Thecontainer thus formed is particularly well suited to withstandmechanical shock. In its formation all surfaces which may be exposed tocontact with the liquid commodity within the container are adequatelycoated with moisture-resisting substance and this coating material isapplied to the mutually facing surfaces of discs 5| and 52 so that thesesurfaces are rigidly attached to each other. If desired, the closurediscs 5| and I52 may be dipped in the coating material prior to assemblywith the body 50.

In each instance the closure discs are fabricated of paper and areformed by pressing or drawing'a flat paper sheet into the form of a Thecost of each element of the container is relatively slight and all suchelements may be quickly and easily assembled to form the completedcontainer. The container will hold a body of liquid for 'a long periodof time without weakening in the slightest, is readily opened, and maythereafter be easily disposed of by burning.

Having thus described the invention, what is claimed as new and desiredto be secured by Letin Figure 2 and is applied in the same manner,.lters Patent is? 1. In. a paper container, a cylindrical bodycomprising a convolutely wound strip of paper, the outer convolutionbeing narrower than the inner convolutions, thus providing 'an externalannularrecess at one end of said body, an end closure disc seatedagainst the end of said body and having a peripheral flange lying insaid recess, a second closure disc within the said body w of said bodyalso provided with a cylindrical and provided with a peripheral flangeengaging the inner wall surface of the body and extending toward thefirst disc.

2. In a paper container, a cylindrical body comprising a convolutelywound strip of paper, the outer convolution being narrower than theinner convolutions, thus providing an external annular shoulder adjacentand facing one end thereof, a closure disc overlying the end of the bodyand having a peripheral cylindrical flange encircling the container endand seating against said shoulder, and a closure disc within the endflange, the side of said flange engaging the inner wall surface of saidbody and its edge abutting said exterior closure disc.

3. ma paper container, a cylindrical body I comprising a convolutelywound strip of paper, the outer convolution being narrower than theinner convolutions, thus providing an external annular recess at oneendof said body, an end closure disc seated against the end of said bodyand having a peripheral flange lying in said recess,. a second closuredisc within the said body and provided with a peripheral flange engagingthe inner wall surface of the body and extending toward the first disc,a moisture-proof envelope encircling said cylindrical body, thecylindrical margin of said envelope overlapping and being secured to theouter surface of the flange of the end closure disc.

CHARLES K. DUNLAP.

